Knurling tool



June 12, 1945.

, E. 1-TURNE'Y KNURLING- `Toor..

Filed Nov. 10, 1945 l for each type of knurling.

Patented June 12, 1945 y KMJRLING from.y

*l Turnen-Holmes, .v y :1 i Application November 1o, 11943; serial 510.599.941

f zola'ims.- (CLM-5.1) I' The 'inventionV herein disclosed relates to knurling tools.

Objects of the invention are to provide a simple,

practical and eicient toolwhich will be capable of producing the various differentkinds'of knurlpractice. 'A

Heretofore -a separate tool has been required The present invention makes it possible to produce the several kinds of knurling required for diierent purposes from a single tool capable of being quickly adjustedor set for such purposes. The novel features of invention by which the 4foregoing and other desirable objects are attained.

'ing ordinarily required in good machine shopl gitudnally slidable within a longitudinal bore I9, extending through the holder.

The forward end of the holder is shown reduced to a cylindrical portion 20, and the end of this cylindrical portion is slotted inwardly at the center at 2 I, and on opposite sides of the center at 22, 23, toreceive a tang or tongue 24, projecting backfrom the head of the yoke.

are set forth in vthefollowing specification, illusl trated'by way of example in the accompanying drawing and broadly covered in the claims.

In the drawing: u y Fig. 1 is a side elevation of-kthe tool as mounted in the tool post of a lathe.l

Fig. 2 is a detached side elevation of the tool,

'showing the vhead of lthe tool pulled out-ready f for setting in different angled relations.

Fig. 3 is an enlarged part sectional view on substantially the plane of line 3-3 of Fig 1. Fig.r` 4 is a broken plan view `of the tool as on the line 4-4 of Fig.` 1, producing a straight cut knurl on a. piece of work. 1

Figs. 5 and 6 are cross-'sectional views similar to Fig. 3, showing the tool set in oppositely angled positions and Figs. 7 and f8 are` broken details lillustrating the workvproducedfby such settings.

rig. 9 'is a broken fdetail illustrating .a

diamond type knurl effect obtained by combining the cuts of Figs. 5 and'. l

Fig. 10 is a similar view illustrating theveffect j' of combining the straight cut of Fig. 4 and the angle cut of Fig. 8. f

Basically, the invention comprises a knurling l wheel or roll II, journalled in a supporting yoke y I2, which can be turned to diierent angular positions in a holder I3.

vcylindrical stemor spindle I8, rotatable and lon- The reduction of the end portion of the holder and the slotting of such thinned portion in troduces -a springquality in the `teeth or strips 25, left between the longitudinal cuts. This in turn permits ofv makingl these cuts approximately the same width or slightly less than the width of the tongue 24, vso that the latter will be frictionally and yieldingly gripped. at any slot into which it may be entered.y

The yoke is further shown vas having an annular shoulder 26, at the back of the same which will abut solidly against the split. end of the holder when the tool is in operation as in Figs. l and 4. A cross pin 21, in the outer, projecting end of the spindle' serves, by engagement `with the outer end of the holder, to limit the inward or unclutching movement of the head to a position such as shown in Fig. 2, where the locking lug 24, will 'clear the end of the holder,l ready to be entered in-a selected slot.

For straight knurling, the knurling head is locked in the center position with the lug 24, entered in the center vslot 2I, of the holder, thus to produce results such as shown in Fig. 4.

Upon .withdrawing the'head and turning it to enter the lug in the right hand slot 22, the inclined knurls such as shown in Fig. 7, will be produced. Conversely, by inclining in the reverse direction and engaging the lug 24, in slot 23, Fig. 6, the reversely inclined knurls such as illustrated in Fig. 8 Will be produced.

By superposing one set of angled cuts on another, that is, by combining the cuts of Figs. '7

and 8, the diamond knurling, such as shown at 28, in Fig. 9, will be produced.

Fig. 10 illustrates a half-diamond form of knurling 29, produced by superimposing the straight and inclined cuts such as illustrated in ldilerent styles of knurling all with a single setting of the tool in the tool post, the change from one style of cut to another being accomplished by simply backingthe tool .01T from the Workv sufciently to permit the unlocking of the knurling head and the locking of it in a nevi7 position.

While in the present disclosure the roll has been shown as having plain straight knurling teeth, it is contemplated that curved or angled or other forms of teeth may be employed and that the results attained .by setting the tool in different positions may be varied accordingly.

The spring fingers in addition to releasably holding the knurling head in the position in which it may be set, avoid lo'oseness and prevent rattling or vibration of parts While the tool is in use.

What is claimed is:

1. A knurling tool, comprising a bar of a size and shape to be removably and adjustably held in an ordinary lathe tool post, said bar having a longitudinal passage therethrough, a stem longitudinally and rotatably adjustable in said passage, a head on the front end of said stem for abutting engagement with the front end of said bar, said end of the bar having longitudinal slots therein and said head having a projecting lug for selective interlocking engagement in one of said slots, a knurling roll journaled in said head, the opposite end of said stem projecting from the opposite end of said bar, and a cross pin on said opposite end of said stem engageable with the opposite end of said bar to limit longitudinal movement of the stem in said passage to an extent suicient to effect disengagement of said lug from said slots.

2. A knurling tool, comprising a tubular 4holder having spaced spring fingers at one end of the same, a yoke having a head portion in 

